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Can't attach files in mail servies or other programs in firefox

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Trying ot attach a file for my online class and found it wouldn't work, check both yahoo and gmail and neither of them can attach mail either please help!!

Trying ot attach a file for my online class and found it wouldn't work, check both yahoo and gmail and neither of them can attach mail either please help!!

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Have you tried to reset Firefox? I have no idea what could have caused this.

Modified by user1089369